I noticed this as well. It seems every tick of Regen adds enmity which doesn't seem like it should be. I dealt with it regardless, just something I wasn't expecting. It sucks when adds spawn mid fight and you have a couple regens on your party. You are instantly targeted.

I kinda like it though. Makes juggling your enmity tougher along with keeping your tank on their toes. Makes for interesting play. Oh how I wish THF was available for hate management. That would be so fun.